Redirect only for GET method

[emeric-martineau]

When we want use Pow, in documentation is explain to put this:

scope "/" do
    pipe_through :browser

    pow_routes()
    pow_extension_routes()
end

but some routes use POST, PATCH... method.
In this case, we must rewrite routes to extract GET to allow i18n with set_locale.
In other way, in my RFC understanding, redirect is only for GET and HEAD : https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html

[coveralls]

Coverage increased (+0.1%) to 98.438% when pulling ac8a3ab on emeric-martineau:master into 9b3b496 on smeevil:master.

[emeric-martineau]

Hi @smeevil,

any news for this PR ?